Does anyone use RE.Net to keep track of their kills? I've been using the website to keep track of my kills and the stats say I defeated 10,000+ enemies. So I'm wondering how come my trophy doesn't pop up....any clue?

I think that total on RE.net combines your Campaign + Raid kills together, where the trophy of course is purely for Raid kills. It should pop by 11,000 - or maybe 12,000 at the worst - depending upon how many Campaign playthroughs you did.